<s>
SCM	B-Language
is	O
a	O
programming	O
language	O
,	O
a	O
dialect	O
of	O
the	O
language	O
Scheme	B-Language
.	O
</s>
<s>
It	O
is	O
written	O
in	O
the	O
language	O
C	B-Language
,	O
by	O
Aubrey	O
Jaffer	O
,	O
the	O
author	O
of	O
the	O
SLIB	B-Application
Scheme	B-Language
library	B-Library
and	O
the	O
JACAL	O
interactive	O
computer	B-Algorithm
algebra	I-Algorithm
(	O
symbolic	B-Algorithm
mathematics	I-Algorithm
)	O
program	O
.	O
</s>
<s>
It	O
conforms	O
to	O
the	O
standards	O
R4RS	B-Language
,	O
R5RS	B-Language
,	O
and	O
IEEE	O
P1178	O
.	O
</s>
<s>
It	O
is	O
free	B-License
and	I-License
open-source	I-License
software	I-License
released	O
under	O
a	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
(	O
LGPL	B-Application
)	O
.	O
</s>
<s>
SCM	B-Language
runs	O
on	O
many	O
different	O
operating	B-General_Concept
systems	I-General_Concept
such	O
as	O
AmigaOS	B-Application
(	O
also	O
emulation	O
)	O
,	O
Linux	B-Application
,	O
Atari-ST	B-Device
,	O
macOS	B-Application
(	O
SCM	B-Language
Mac	I-Language
)	O
,	O
DOS	B-Device
,	O
OS/2	B-Application
,	O
NOS/VE	B-Operating_System
,	O
Unicos	B-Operating_System
,	O
VMS	B-Operating_System
,	O
Unix	B-Application
,	O
and	O
similar	O
systems	O
.	O
</s>
<s>
SCM	B-Language
includes	O
Hobbit	O
,	O
a	O
Scheme-to-C	O
compiler	B-Language
written	O
originally	O
in	O
2002	O
by	O
Tanel	O
Tammet	O
.	O
</s>
<s>
It	O
generates	O
C	B-Language
files	O
which	O
binaries	O
can	O
be	O
dynamically	B-Application
or	O
statically	B-Library
linked	O
with	O
an	O
SCM	B-Language
executable	O
.	O
</s>
<s>
SCM	B-Language
includes	O
linkable	O
modules	O
for	O
SLIB	B-Application
features	O
like	O
sequence	O
comparison	O
,	O
arrays	O
,	O
records	O
,	O
and	O
byte-number	O
conversions	O
,	O
and	O
modules	O
for	O
Portable	O
Operating	B-General_Concept
System	I-General_Concept
Interface	O
(	O
POSIX	O
)	O
system	O
calls	O
and	O
network	B-Protocol
sockets	I-Protocol
,	O
Readline	B-Application
,	O
curses	B-Device
,	O
and	O
Xlib	B-Language
.	O
</s>
<s>
On	O
some	O
platforms	O
,	O
SCM	B-Language
supports	O
unexec	O
(	O
developed	O
for	O
Emacs	B-Application
and	O
bash	B-Operating_System
)	O
,	O
which	O
dumps	O
an	O
executable	O
image	O
from	O
a	O
running	O
SCM	B-Language
.	O
</s>
<s>
This	O
results	O
in	O
a	O
fast	O
startup	O
for	O
SCM	B-Language
.	O
</s>
<s>
SCM	B-Language
developed	O
from	O
Scheme	B-Language
In	I-Language
One	I-Language
Defun	I-Language
(	O
SIOD	B-Language
)	O
in	O
about	O
1990	O
.	O
</s>
<s>
GNU	B-Application
Guile	I-Application
developed	O
from	O
SCM	B-Language
in	O
1993	O
.	O
</s>
